Which two items in MIG welding would need to be changed if the size of mild steel wire electrode is changed from 0.9 mm to 1.2 mm?
(a)Contact tip and shroud
(b) Contact tip and drive rollers
(c) Gas diffuser and drive rollers
(d) Gas bottle and earth clamp

MAG process differs from NflG in that it uses instead of inert gases.
(a) Hydrogen
(b) Nitrogen
(c) C02
(d) All of these
Electroslag welding is -
(a) An arc welding process
(b) A gas welding process
(c) A non-arc welding process
(d) A resistance welding process
Electroslag welding is done in -
(a)Flat position
(b)Overhead position
(c) Vertical position
(d) Any position

Which statement applies to thermit welding?
(a)It needs no external source of current
(b) It is suitable for joining parts having heavy cross — section
(c)The slag formed in this process is A1203
(d)All of these

Steel is an alloy of -
(a) Chromium and iron
(b) Sulphur and phosphorous

(c) Iron and carbon
(d) Manganese and riickel
Post — heating of weld is applied -
(a) Immediately after welding
(b) Before welding
(c) During welding
(d) None of these

What does the tem 'pass' refer to as regards welded joint? (a) Depression in base metal(c) Shape of weld bead(b) Each layer of weld bead deposited(d) Distance from electrode to metal

The process of heating to a certain temperature and then quenching in order to make the
metal tough is the heat treatment process called -
(a) Hardening
(b) Annealing
(c) Tempering
(d) Normalizing
For submerged arc welding, what is the effect of raising arc voltage but keeping all other parameters the same?
(a)Weld bead width will increase
(b)Depth of penetration will increase
(c) Weld bead width will decrease
(d) Depth of penetration will decrease

What steps can be taken to prevent welding hazards in workshop?
(a)Idenüfy risks
(b) Evaluate hazards
(c) Establish control methods
(d) All of these

Thermit welding uses what to work?
(a)Oxygen and acetylene combined to form a flame
(b)Resistance of two metals held under pressure
(c) Enveloping tungsten using hydrogen gas
(d) An exothermic reaction between aluminium powder and metal oxide

Rotation of one of the workpieces to be joined is required in -
(a) Thermit welding(b) Electroslag welding
(c) Friction welding
(d) TIG welding

18/A/C/SO/2/E
32.In TIG welding the electrode manipulated by the welder is - (a) Made of tungsten(c) Both (a) and (b) (b) Not consumed(d) None of these
33.When visually inspecting the root bead of a single V butt weld it should be checked for(a) Lack of root penetration(c) Tungsten inclusion(b) HAZ hardness(d) Slag
34. A burn — through in a welded joint may occur if(a) Current is too low(c) Root gap is too large(b) Root face is too large(d) Arc voltage is too high
35.If a welding inspector detects a type of imperfection not allowed by the application standard, he should -
(a)Ask for explanation
(b)Reject the wéld

(c)Prepare a concession request
(d)Reject the weld only if he considers it to be harmful
36.If the unit of power is expressed in watt, which of the following is a correct relationship? (a) Power (watt) = Ampere x Volt(c) Power (watt) = Volt x Ohm(b) Power (watt) = Ampere x Ohm(d) Power (watt) = Ampere x Volt x Ohm
37.If 100 mm thick plates are to be welded, which of the following processes should be selected so as to get high production rate with square edge preparation?
(a)Electroslag welding(c) TIG welding (b) C02 welding(d) Friction welding
38.In which of the following non-destructive methods, there is no need for supply of electricity?
(a) X — ray test (c) Dye penetrant test(b) Ultrasonic test (d) Hydraulic pressure test
...6/
18/NC/S-2/2/E-6-
39.The limitation of electron beam welding is (a) High equipment cost
(b)The size of work chamber is a constraint
(c)Rapid solidification rate can cause cracking in some materials (d) All of these
40.Protective equipment not suitable for eye protection from welding radiation includes -
(a)Welding helmet with filter plates(c) Safety goggles with filter plates
(b)Clear safety goggles(d) Protective screens
41.Which of the following is not considered a type of metal transfer for GMAW? (a) Short circuiting(c) Globular
(b)Spray(d) Droplet
42.The main types of welding joints are -
(a) Flat, square, angled, upright and vertical
(b)Horizontal, single-V, double-V, T-joint and overhead